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To all the members that have already done the swap can you tell me where your primary 02 sensor (on the cat convertor )is hooked up to? I need help in finding out where the primary 02 sensor on the cat convertor plugs in. My sencondary sensor on the cat is plugged in, but not the primary. Do you know where I can find that plug. I traced where the secondary was plugged into but couldn't find another wire. Any help would be appreciated. Can you just give me a general vicinity on where it would be located on in the harness.